CVE-2025-40745: 
Siemens Tecnomatix Plant Simulation vulnerability analysis and mitigation

CVE-2025-40745 is an improper certificate validation vulnerability (CWE-295) affecting multiple Siemens industrial and engineering software products. The flaw exists in the Analytics Service endpoint connection logic, where affected applications fail to properly validate client certificates, enabling unauthenticated remote attackers to conduct man-in-the-middle (MITM) attacks. Affected products include Siemens Software Center (< V3.5.8.2), Simcenter 3D (< V2506.6000), Simcenter Femap (< V2506.0002), Simcenter STAR-CCM+ (< V2602), Solid Edge SE2025 (< V225.0 Update 13), Solid Edge SE2026 (< V226.0 Update 04), and Tecnomatix Plant Simulation (< V2504.0008). The vulnerability was published on April 14, 2026, with a CVSS v3.1 base score of 3.7 (Low) and a CVSS v4.0 base score of 6.3 (Medium) (Siemens Advisory, GitHub Advisory).

The root cause is CWE-295 (Improper Certificate Validation): the affected applications do not properly validate client certificates when establishing connections to the Analytics Service endpoint, allowing an attacker to present a fraudulent certificate without detection. This network-accessible attack vector requires no privileges, no user interaction, but does require specific network conditions (e.g., the attacker must be positioned on the network path between the client and the Analytics Service). The attack complexity is rated High under CVSS v3.1 due to these prerequisite network positioning requirements. No public proof-of-concept exploit code has been identified (Siemens Advisory, GitHub Advisory).

Successful exploitation allows an unauthenticated remote attacker to intercept and potentially read communications between affected Siemens applications and the Analytics Service endpoint, resulting in a low confidentiality impact. There is no integrity or availability impact identified — the attacker cannot modify data or disrupt service through this vulnerability alone. The primary risk is exposure of sensitive telemetry or analytics data transmitted by the affected engineering and simulation software (Siemens Advisory, GitHub Advisory).

1. Network Positioning: Gain a man-in-the-middle position on the network path between a host running an affected Siemens application and the Analytics Service endpoint, using techniques such as ARP spoofing, DNS poisoning, or rogue Wi-Fi access points.
2. TLS Interception Setup: Deploy a TLS interception proxy (e.g., mitmproxy, Burp Suite) configured with a self-signed or attacker-controlled certificate for the Analytics Service domain.
3. Intercept Connection: When the affected Siemens application (e.g., Solid Edge, Simcenter Femap) initiates a connection to the Analytics Service, the proxy presents the attacker's certificate. Due to the improper certificate validation flaw, the application accepts the fraudulent certificate without error.
4. Data Capture: The proxy decrypts and logs the plaintext communications between the application and the Analytics Service, capturing any sensitive analytics or telemetry data transmitted.
5. Optional Relay: Forward the traffic to the legitimate Analytics Service to avoid detection, maintaining a transparent interception (Siemens Advisory).

• Network: Unexpected TLS certificate changes or mismatches for the Siemens Analytics Service endpoint; SSL/TLS handshake errors or certificate validation warnings in network logs; unusual intermediate hosts appearing in network traces between Siemens application hosts and the Analytics Service.
• Logs: SSL/TLS certificate validation failure events in application or system logs; unexpected certificate issuer or subject names in TLS session logs for Analytics Service connections.
• Process/Application: Siemens application logs showing connectivity anomalies or repeated reconnection attempts to the Analytics Service endpoint.

Siemens has released patched versions for all affected products. Organizations should update to the following minimum versions: Siemens Software Center V3.5.8.2, Simcenter 3D V2506.6000, Simcenter Femap V2506.0002, Simcenter STAR-CCM+ V2602, Solid Edge SE2025 V225.0 Update 13, Solid Edge SE2026 V226.0 Update 04, and Tecnomatix Plant Simulation V2504.0008. As interim mitigations, implement network segmentation to restrict access to systems communicating with the Analytics Service endpoint, and deploy network monitoring to detect suspicious SSL/TLS certificate validation anomalies (Siemens Advisory).

Coverage of CVE-2025-40745 has been limited to automated vulnerability tracking platforms and aggregators such as VulnDB, CVE.report, and ENISA's EUVD. A brief post was noted on Bluesky via a CVE tracking account, and a short write-up appeared on infinitsec.net shortly after disclosure. No significant researcher commentary, vendor statements beyond the official Siemens advisory, or major media coverage has been identified (Siemens Advisory).